Crimp lock pull nose assembly



Aug. 11, 1964 a. J. VAN HECKE CRIMP LOCK PULL NOSE ASSEMBLY 2 Sheets-Sheet 1 Filed Oct. 19, 1961 INVENTOR. Geaye .7." 1 477 fiffcie United States Patent 3,143,903 CRIMP LOCK PULL NOSE ASSEMBLY George J. Van Hecke, Detroit, Mich, assignor to Huck Manufacturing Company, Detroit, Mich, a corporation of Michigan Filed Oct. 19, 1961, Ser. No. 146,212 8 Claims. (CI. 78-46) This invention relates to apparatus for setting fasteners. One type of fastener to be set by the apparatus of this invention includes a pin having a head and a shank provided with looking grooves and a plurality of pull grooves; a collar which is first loosely fitted on the shank is then swaged into the locking grooves by means of a tool which is capable of. gripping the pin via the plurality of pull grooves and applying a relative axial force between the pin and the collar such as to swage the collar into the locking grooves. It is an object of this invention to provide an improved apparatus for setting fasteners of the above type.

It is a further object of this invention to provide an improved apparatus for setting fasteners of the above type in which the collar is crirnped into the locking grooves in the pin.

It would be advantageous if a crimping device could be provided in the form of a nose assembly which is usable with conventional and commercially available pull gun apparatus. Another object of this invention is to provide an improved nose assembly for applying fasteners of the type described above which is usable with commercially available pull guns.

Other objects, features, and advantages of the present invention will become apparent from the subsequent description and the appended claims, taken in conjunction with the accompanying drawings, in which:

FIGURE 1 is a fragmentary longitudinal sectional view of one type of a riveting gun showing the apparatus of this invention in assembly relation therewith;

FIGURE 2 is an enlarged longitudinal sectional view showing a portion of the apparatus depicted in FIGURE 1 in relation to a fastener to be set;

FIGURE 3 is a sectional view taken substantially along the lines 3-3 of FIGURE 2;

FIGURE 4 is a sectional view taken substantially along the lines 4-4 in FIGURE 2; and

FIGURE 5 is a view similar to that of FIGURE 2 showing the apparatus therein in a position after the collar has been crimped into the locking grooves of the pin.

Looking now to FIGURE 1, the nose assembly or crimping mechanism of this invention is generally indicated at and is shown in assembly relationship with a riveting gun 12 (partially shown) of a conventional type. The gun 12 includes a housing 14 and a piston 16 mounted for reciprocating movement therein, which piston has a threaded front end portion 18. The piston 16 is formed on opposite radial sides of a central portion thereof with recesses 20, only one of which is shown, for matably receiving a bifurcated portion 21 at one end of a lever member 22 which is supported intermediate its ends on a pivot 24 which in turn is carried on a handle 26 for the gun 12. The opposite end of the lever member 22 carries a roller 30 which is adapted to roll between a pair of inclined guides 32 and 34 which are movable within the handle 26 toward and away from the pivot 24. On movement of the guides 32 and 34 away from the pivot 24, the lever member 22 is pivoted in a counterclockwise direction about the pivot point 24 and thereby moves the plunger or piston 16 in a forward direction. Likewise, when the guides 32 and 34 are moved toward the pivot points 24, the lever member 22 is moved in a clockwise direction to thereby move the piston 16 rearwardly as viewed in FIGURE 1. A trigger 28 on the handle operates a hydraulic or other type mechanism in a Well-known manner to move the guides 32 and 34 in the desired direction.

The nose assembly 10 has a generally tubularly shaped outer shell member 36 which has a pair of ears or lugs 38 located externally thereon and is secured thereby to the housing 14 of the riveting mechanism 12 by means known to the art. The nose assembly 10 has a connecting member 40 which has one end threadably secured to the threaded front end portion 18 of the piston 16 and is slidably disposed within a reduced diameter portion 42 of the outer shell member 36. The connecting member 40 has a threaded stud portion 44 at its other end upon which is threadably secured one end of a generally tubularly shaped collet member 46. The opposite or forward end of the collet member 46 terminates in a bore 48 which tapers axially inwardly radially outwardly and terminates in an enlarged longitudinally extending bore 50.

A chuck jaw assembly 52 comprised of a plurality of chuck jaw members has a frusto conically shaped forward portion 54 having an angle of inclination substantially the same as the angle of the taper of the bore 48 and is urged forwardly into the bore 48 by means of a coil spring member 56 located within the enlarged bore 50 which has one end bearing against the rear surface of the chuck jaw assembly 52 and has its opposite end bearing against the threaded or rear end of the collet member 46. The plurality of chuck jaws in the chuck jaw assembly 52 are retained together and urged radially inwardly by means of an O-ring 58 which is disposed in a circumferential groove 59 in the outer surface of the rear portion of the chuck jaw assembly 52. Thus the spring member 56 tends to force the chuck jaw assembly 52 axially forwardly and into the tapered bore 48 while the O-ring member 58 urges the members of the chuck jaw assembly 52 radially inwardly. The chuck jaw assembly 52 defines a central aperture and has a plurality of teeth 60 disposed on the radially inward side of each of the chuck jaw members extending inwardly of the aperture in order to grip the plurality of pull grooves of the fastener member in a manner to be described.

The outer sleeve or shell member 36 terminates at its forward end in an enlarged diameter portion 62 which has an enlarged diameter bore 64 therein which forms with the reduced diameter portion 42 a radially extending shoulder 66. The increased diameter bore 64 of the increased diameter portion 62 terminates at its forward end in an axially outwardly radially outwardly extending tapered portion 68 which serves a purpose to be described.

Slidably disposed within the bore 64 and radially spaced from the collet member 46 is an outer collet or crimping member 70 (FIGURES l and 2). The outer collet member 70 is comprised of a rearwardly disposed annular ring portion 72 which is of a diameter for slidable engagement within the enlarged bore 64 and has a plurality of circumferentially disposed fingers 74 axially extending therefrom and each being separated by an axially extendingslot or gap 76 (FIGURES 3 and 4). Each of the plurality of fingers 74' is capable of movement either radially inwardly or radially outwardly and the resilience of each finger 74 allows such radial displacement and in turn provides a force tending to return that finger 74 to its original position. The crimping member 70 is retained within the enlarged bore 64 by means of a pair of pins 78 which are disposed in transverse bores extending through the enlarged portion 62 of the outer shell member 36 and which have a portion extending radially inwardly into the bore 64 which is engageable with a radial shoulder 80 defined by the juncture of the ring portion 72 and the fingers 74. The axially extending finger por tions 74 define at their outer or free ends a frusto-conically shaped outer surface 82 having an angle of inclination substantially equal to the angle of inclination of the tapered bore 68; the outer surface 82 is disposed partially within the tapered bore 68. Each of the fingers 74 terminates at its outer or free end in a radially inwardly extending portion 84 which has at its extremity a bulbed or radially inwardly curved portion 86 having a configuration to facilitate crimping in a manner to be described. The plurality of curved portions 86 define an aperture which serves a purpose to be seen. The forward portion 84 of the crimping member 70 has a substantially flat front surface 88- and a substantially flat rear surface 90.

A collar retaining member 92, having a bore 120 extending axially and centrally therethrough, has a generally annular flange portion 94 which is urged into engagement with the rear surface 90 of the portion 84 of the crimping member 70 by means of a coil spring member 96 which is compressively preloaded and has one end in abutment with the annular flange portion 94 and has its other end in abutment with the shoulder 66 on the outer shell member 36. The coil spring member 96 not only maintains the collar retainer 92 in abutment with the inner or rear surface 90, but also maintains the crimping member 70 in its outermost position with the shoulder 80 in abutment with the pins 78. With the crimping member 70 in its forward position, the finger members 74 are maintained radially outwardly by their resilience or spring action, as is best seen in FIGURE 2. The collar retainer member 92 has a centrally disposed boss 98 which extends axially outwardly from the annular flange 94 toward the aperture defined by the bulbed portions 86 and serves a purpose to be described.

Looking now to FIGURE 2, the nose assembly is utilized to set a fastener, generally indicated by the numeral 100, which is comprised of a pin 102 which has a shank portion 110 which extends through aligned bores in a pair of plates 106 and 108 and which has an enlarged head 104 on one end thereof in abutment with the rear plate 106. The shank 110 has located thereon a pair of locking grooves 112 and adjacent thereto has a breakneck groove 114. On the opposite end of the pin 102 is disposed a plurality of pull or gripping grooves 116. A tubular collar or sleeve 118 is adapted to be located about the shank of the pin 102 such as to be in alignment with the locking grooves 112 when the plates 106 and 108 are pulled together as shown in FIGURE 2.

In order to set the fastener, the nose assembly 10 is moved proximate to the pin 100 with the pin being inserted through the aperture defined by the curved portions 86. The centrally disposed bore 120 in the collar retaining member 92 is of a diameter to receive the shank 110 of the pin 102. As the shank 110 is inserted axially into the nose assembly 10, the end of the shank 110 contacts the forward end of the chuck jaw assembly 52, moving that assembly axially rearwardly and causing the jaw members to move radially outwardly, thereby admitting the pin 102 therethrough. Note that the enlarged diameter bore 50 allows for the radially outward movement of the jaws. The nose assembly is moved axially over the fastener 100 until the front face 88 is in abutment with the first or forward workpiece 108. At the same time the boss 98 on the collar retainer 92 contacts the collar 118 and causes it to be held against the forward workpiece 108. The spring 96, by bearing against the retainer 92, provides a means whereby the collar 118 is so retained, regardless of dimensional variations. At this time, the plurality of teeth 60 on the chuck jaw assembly 52 are in engagement with a portion of the plurality of pull grooves 116 of the shank 110 of the pin 102. At the same time, the plurality of fingers 74 have their curved surfaces 86 extending circumferentially about the collar 118. Upon actuation of the pull gun 12, the piston 16 is caused to move axially rearwardly, thus causing the collet member 46 to be moved rearwardly with respect to the outer shell member 36. This relative motion causes the outer shell member 36 to be moved forwardly with respect to the crimping member 70, causing the surface of the inclined bore 68 to be moved over the frusto-conically shaped surface 82, causing the plurality of fingers 74 to be moved radially inwardly. Since the front face 88 of the crimping member 70 is in abut ment with the forward plate 108, the above-described relative movement occurs as a result of the axial force of the head 104 of the pin 102 on the rear plate 106 and the reaction of the front face 88 against the forward plate 108. Hence, initially the plates 106 and 108 are pulled together by the above described axial force. As this relative axial movement continues, the curved portion 86 of the forward portion 84 moves radially inwardly into the collar member 118, causing the material of that collar to be crimped or to be flowed radially inwardly to fill the locking grooves 112 of the pin 102 (see FIG- URE 5).

Upon further axial movement of the piston 16, the ring portion 72 of the crimping member 70 engages the shoulder 66 in the outer shell member 36; this prevents any further radially inward movement of fingers 74. The axial force applied relative to the pin 102 and the workpieces 106 and 108 is increased until the pin is severed at the breakneck groove 114. Note that, at this time, the front surface 88 is flush with the front surface 121 of the enlarged portion 62 of the outer shell member 36 (FIGURE 5).

Upon the setting of the fastener 100, axial rearward movement of the nose assembly 10 and, hence, of the outer shell member 36, causes the outer shell member 36 to move rearwardly axially relative to the crimping member 70, thereby allowing the plurality of fingers 74 to move resiliently radially outwardly out of engagement with the collar member 118 until the nose assembly 10 is disengaged completely from the upset fastener 100. Note that the spring member 96 (FIGURE 5), with the fastener set, exerts an axial force aiding in the axial separation of the crimping member 70 from the enlarged bore 64 of the outer shell member 36.

The ring portion 72 of the crimping member 70, by being provided of a size substantially equal to the diameter of the enlarged bore 64, is slidable therein and thereby acts as a guide to prevent cocking or tilting of the crimping member 70 upon the insertion of a fastener 100. Note that, by providing a shoulder 66 to be engageable with the rear face of the ring portion 72 of the crimping member 70, means are thereby provided to positively restrict the relative movement between the crimping member 70 and the outer shell member 36 such that, when the collar 118 is completely crimped onto the pin member 102, the crimping member 70 is then locked to the outer shell member 36 such that the only forces present on the fastener 100 is the axial force applied between the pin member 102 and the workpieces 106 and 108. This construction provides, therefore, a limit to the extent the crimping member 70 is received within the outer shell member 36, thus protecting the crimping member 70 from damage; it also provides a preselected limit to the extent or depth of the crimp in the collar 118; lastly, it protects the outer shell member 36 from damage by providing that the axial force be reacted by both the crimping member 70 and the enlarged portion 62 of the outer shell member 36 during the final step in setting the fastener 100 as shown in FIGURE 5.

While it will be apparent that the preferred embodiment of the invention disclosed is well calculated to fulfill the objects above stated, it will be appreciated that the invention is susceptible to modification, variation and change without departing from the proper scope or fair meaning of the subjoined claims.

What is claimed is:

1. Apparatus for applying a fastener which includes a pin having a head and a shank and locking grooves formed in the shank at a position spaced from the head and a collar disposed on the shank at a position radially about the locking grooves, said apparatus comprising an outer shell member having a bore at one end terminating in an axially outwardly radially outwardly tapered surface, a crimping member axially movably disposed in said bore comprising a plurality of circumferentially disposed axially outwardly extending resilient fingers each havingat one end a radially inwardly extending crimping portion, said plurality of fingers defining at said one end a frusto-conically shaped, radially outwardly disposed surface matable with said tapered surface of said outer shell member during axial movement of said crimping member in said bore in said outer shell member and being movable radially responsively to axial movement of said crimping member in said bore in said outer shell member, jaw means disposed within said outer shell member for grippingly engaging the shank of the pin of the fastener, means for applying a relative axial force between said jaw means and said outer shell member for effectuating an axial pull on the pin and for eifectuating movement of said crimping member axially within said bore in said outer shell member, a collar retainer member disposed within said bore in said outer shell member and having a portion engageable with the collar of the fastener, and spring means disposed within said bore of said outer shell member for urging said collar retainer axially outwardly for engagement with the collar of the fastener.

2. Apparatus for applying a fastener which includes a pin having a head and a shank and locking grooves formed in the shank at a position spaced from the head and a collar disposed on the shank at a position radially about the locking grooves, said apparatus comprising an outer shell member having a bore at one end terminating in an axially outwardly radially outwardly tapered surface, a crimping member axially movably disposed in said bore comprising a plurality of circumferentially disposed axially outwardly extending resilient fingers each having at one end a radially inwardly extending crimping portion, said plurality of fingers defining at said one end a frusto-conically shaped, radially outwardly disposed surface matable with said tapered surface of said outer shell member during axial movement of said crimping member in said bore in said outer shell member and being movable radially responsively to ax al movement of said crimping member in said bore in said outer shell member, jaw means disposed within said outer shell member for grippingly engaging the shank of the pin of the fastener, means for applying a relative axial force between said jaw means and said outer shell member for eifectuating an axial pull on the pin and for eifectuating movement of said crimping member axially within said bore in said outer shell member, a collar retainer member disposed within said bore in said outer shell member and having a portion engageable with the collar of the fasteners, and spring means disposed within said bore of said outer shell member for urging said collar retainer axially outwardly for engagement with the collar of the fastener and for urging said crimping member axially outwardly from said bore in said outer shell member.

3. Apparatus for applying a fastener which includes a pin having a head and a shank and locking grooves formed in the shank at a position spaced from the head and a collar disposed on the shank at a position radially about the locking grooves, said apparatus comprising an outer shell member having a bore at one end terminating in an axially outwardly radially outwardly tapered surface, a crimping member axially movably disposed in said bore comprising a plurality of circumferentially disposed axially outwardly extending resilient fingers each having at one end aradially inwardly extending crimping portion, said plurality of fingers defining at said one end a frusto-conically shaped, radially outwardly disposed surface matable with said tapered surface of said outer shell member during axial movement of said crimping 6, member in said bore in said outer shell member and being movable radially inwardly upon axial rearward movement of said crimping member in said bore in said outer shell member, jaw means disposed within said outer shell member for grippingly engaging the shank of the pin of the fastener, means for applying a relative axial force between said jaw means and said outer shell member for effectuating an axial pull on the pin and for eifectuating movement of said crimping member axially rearwardly, a collar retainer member disposed within said bore in said outer shell member and having a portion engageable with the collar of the fastener, and spring means disposed within said bore of said outer shell member for urging said crimping member axially outwardly from said bore in said outer shell member.

4. Apparatus for applying a fastener which includes a pin having a head and a shank and locking grooves formed in the shank at a position spaced from the head and a collar disposed on the shank at a position radially about the locking grooves, said apparatus comprising an outer shell member having a bore at one end terminating in an axially outwardly radially outwardly tapered surface, a crimping member axially movably disposed in said bore comprising a generally annular portion slidably and matably disposed within said bore in said outer shell member for guiding said crimping member within said bore and a plurality of resilient fingers circumferentially disposed about and extending axially outwardly from said annular portion and each having at one end a radially inwardly extending crimping portion, said plurality of fingers defining at said one end a frusto-conically shaped, radially outwardly disposed surface matable with said tapered surface of said outer shell member during axial movement of said crimping member in said bore in said outer shell member and being movable radially responsively to axial movement of said crimping member in said bore in said outer shell member, jaw means disposed within said outer shell member for grippingly engaging the shank of the pin of the fastener, means for applying a relative axial force between said jaw means and said outer shell member for eifectuating an axial pull on the pin and for effectuating'movement of said crimping member axially within said bore in said outer shell member, a collar retainer member disposed within said bore in said outer shell member and having a portion engageable with the collar of the fastener, and spring means disposed within said bore of said outer shell member for urging said collar retainer axially outwardly for engagement with the collar of the fastener and for urging said crimping member axially outwardly from said bore in said outer shell member.

5. Apparatus for applying a fastener which includes a pin having a head and a shank and locking grooves formed in the shank at a position spaced from the head and a collar disposed on the shank at a position radially about the locking grooves, said apparatus comprising an outer shell member having a bore at one end terminating in an axially outwardly radially outwardly tapered surface, a crimping member axially movably disposed in said bore comprising a purality of circumferentially disposed axially outwardly extending resilient fingers each having at one end a radialy inwardly extending crimping portion, means operatively associated with said crimping member and said outer shell member for limiting the movement of said crimping member axially rearwardly within said bore, said plurality of fingers defining at said one end a frusto-conically shaped, radially outwardly disposed surface matable with said tapered surface of said outer shell member during axial movement of said crimping member in said bore in said outer shell member and being movable radially responsively to axial movement of said crimping member in said bore in said outer shell member, jaw means disposed within 'said outer shell member for grippingly engagingthe shank of the pin of the fastener, means for applying a relative axial force between said jaw means and said outer shell member for effectuating an axial pull on the pin and for effectuating movement of said crimping member axially within said bore in said outer shell member, a collar retainer member disposed within said bore in said outer shell member and having a portion engageable with the collar of the fastener, and spring means disposed within said bore of said outer shell member for urging said collar retainer axially outwardly for engagement with the collar of the fastener and for urging said crimping member axially outwardly from said bore in said outer shell member.

6. Apparatus for applying a fastener which includes a pin having a head and a shank and locking grooves formed in the shank at a position spaced from the head and a collar disposed on the shank at a position radially about the locking grooves, said apparatus comprising an outer shell member having at its forward end a bore with an axially outwardly radially outwardly tapered surface facing outwardly from said forward end and having a radially inwardly extending shoulder disposed in said bore and spaced axially rearwardly from said forward end a predetermined distance, a crimping member axially movably disposed in said bore comprising a generally annular portion slidably and matably disposed within said bore and engageable with said shoulder for limiting the axially rearward movement of said crimping member in said bore and a plurality of resilient fingers circumferentially disposed about and extending axially outwardly from said annular portion such that the forward surfaces of said fingers and of said outer shell member are subtantially flush when said annular portion engages said shoulder, said plurality of fingers defining at said one end a frusto-conically shaped, radially outwardly disposed surface matablewith said tapered surface of said outer shell member during axial movement of said crimping member in said bore in said outer shell member and being movable radially responsively to axial movement of said crimping member in said bore in said outer shell member, jaw means disposed within said outer shell member for grippingly engaging the shank of the pin of the fastener, means for applying a relative axial force between said jaw means and said outer shell member for effectuating an axial pull on the pin and for effectuating movement of said crimping member axially within said bore in said outer shell member, a collar retainer member disposed within said bore in said outer shell member and having a portion engageable with the collar of the fastener, and spring means disposed within said bore of said outer shell member for urging said collar retainer axially outwardly for engagement with the collar of the fastener and for urging said crimping member axially outwardly from said bore in said outer shell member.

7. Apparatus for applying a fastener which includes a pin having a head and a shank and locking grooves formed in the shank at a position spaced from the head and a collar disposed on the shank at a position radially about the locking grooves, said apparatus comprising an outer shell member having at its forward 'end a bore with an axially outwardly, radially outwardly tapered surface facing outwardly from said forward end and having a radially inwardly extending shoulder disposed in said bore and spaced axially rearwardly from said forward end a predetermined distance, a crimping member axially movably disposed in said bore comprising a generally annular portion slidably and matably disposed within said bore for guiding said crimping member within said bore and engageable with said shoulder for limiting the axially rearward movement of said crimping member in said bore, a plurality of resilient fingers circumferentially disposed about and extending axially outwardly from said annular portion such that the forward surfaces of said fingers and of said outer shell member are substantially flush when said annular portion engages said shoulder and crimping portions integral with and extending radially inwardly from the forward end of each of said plurality of fingers and radially defining an aperture for receiving the collar of the fastener, said plurality of fingers defining at said forward end a frusto-conically shaped, radially outwardly disposed surface matably engageable with said tapered surface of said outer shell member during axial movement of said crimping member in said bore in said outer shell member and being movable radially responsively to axial movement of said crimping member in said bore in said outer shell member, jaw means disposed within said outer shell member for grippingly engaging the shank of the pin of the fastener, means for applying a relative axial force between said jaw means and said outer shell member for effectuating an axial pull on the pin and for eifectuating movement of said crimping member axially within said bore in said outer shell member, a collar retainer member disposed within said bore in said outer shell member and having an axially forwardly extending boss portion engageable with the collar of the fastener when the collar is disposed within said aperture defined by said crimping portions, stop means extending radially into said bore for limiting the axially forward movement of said crimping member, and spring means disposed within said bore of said outer shell member for urging said collar retainer axially outwardly for engagement with the collar of the fastener and for urging said crimping member axially outwardly from said bore in said outer shell member toward said stop means. 8. Apparatus for applying a fastener which includes a pin having a head and a shank and locking grooves formed in the shank at a position spaced from the head and a collar disposed in the shank at a position radially about the locking grooves, said apparatus comprising an outer shell member having at its forward end a bore with an axially outwardly, radially outwardly tapered surface facing outwardly from said forward end and having a radially inwardly extending shoulder disposed in said bore and spaced axially rearwardly from said forward end a predetermined distance; a crimping member axially movably disposed in said bore comprising a generally annular portion slidably and matably disposed within said bore, a rear surface engageable with said shoulder for limiting the axially rearward movement of said crimping member in said bore, and a plurality of resilient fingers circumferentially disposed about and extending axially outwardly from said annular portion such that the forward surfaces of said fingers extend at least up to the forward surface of said shell member when said rear surface engages said shoulder, said plurality of fingers defining at said one end a frusto-conically shaped, radially outwardly disposed surface matable with the tapered surface of said outer shell member during axial movement of said crimping member in said bore in said outer shell member and being movable radially responsively to axial movement of said crimping member in said bore in said outer shell member; jaw means disposed within said outer shell member for grippingly engaging the shank of the pin of the fastener; means for applying a relative axial force between said jaw means and said outer shell member for effectuating an axial pull on the pin and for effectuating movement of said crimping member axially within said bore in said outer shell member, a collar retainer member disposed within said bore in said outer shell member and having a portion engageable with the collar of the fastener; and spring means disposed within said bore of said outer shell member for urging said collar retainer axially outwardly for engagement with the collar of the fastener and for urging said crimping member axially outwardly from said bore in said outer shell member.

References Cited in the file of this patent UNITED STATES PATENTS 

1. APPARATUS FOR APPLYING A FASTENER WHICH INCLUDES A PIN HAVING A HEAD AND A SHANK AND LOCKING GROOVES FORMED IN THE SHANK AT A POSITION SPACED FROM THE HEAD AND A COLLAR DISPOSED ON THE SHANK AT A POSITION RADIALLY ABOUT THE LOCKING GROOVES, SAID APPARATUS COMPRISING AN OUTER SHELL MEMBER HAVING A BORE AT ONE END TERMINATING IN AN AXIALLY OUTWARDLY RADIALLY OUTWARDLY TAPERED SURFACE, A CRIMPING MEMBER AXIALLY MOVABLY DISPOSED IN SAID BORE COMPRISING A PLURALITY OF CIRCUMFERENTIALLY DISPOSED AXIALLY OUTWARDLY EXTENDING RESILIENT FINGERS EACH HAVING AT ONE END A RADIALLY INWARDLY EXTENDING CRIMPING PORTION, SAID PLURALITY OF FINGERS DEFINING AT SAID ONE END A FRUSTO-CONICALLY SHAPED, RADIALLY OUTWARDLY DISPOSED SURFACE MATABLE WITH SAID TAPERED SURFACE OF SAID OUTER SHELL MEMBER DURING AXIAL MOVEMENT OF SAID CRIMPING MEMBER IN SAID BORE IN SAID OUTER SHELL MEMBER AND BEING MOVABLE RADIALLY RESPONSIVELY TO AXIAL MOVEMENT OF SAID CRIMPING MEMBER IN SAID BORE IN SAID OUTER SHELL MEMBER, JAW MEANS DISPOSED WITHIN SAID OUTER SHELL MEMBER FOR GRIPPINGLY ENGAGING THE SHANK OF THE PIN OF THE FASTENER, MEANS FOR APPLYING A RELATIVE AXIAL FORCE BETWEEN SAID JAW MEANS AND SAID OUTER SHELL MEMBER FOR EFFECTUATING AN AXIAL PULL ON THE PIN AND FOR EFFECTUATING MOVEMENT OF SAID CRIMPING MEMBER AXIALLY WITHIN SAID BORE IN SAID OUTER SHELL MEMBER, A COLLAR RETAINER MEMBER DISPOSED WITHIN SAID BORE IN SAID OUTER SHELL MEMBER AND HAVING A PORTION ENGAGEABLE WITH THE COLLAR OF THE FASTENER, AND SPRING MEANS DISPOSED WITHIN SAID BORE OF SAID OUTER SHELL MEMBER FOR URGING SAID COLLAR RETAINER AXIALLY OUTWARDLY FOR ENGAGEMENT WITH THE COLLAR OF THE FASTENER. 